Bonfire furnace



FIG. 1 is a front elevation view showing our new design;

FIG. 2 is a back elevation view thereof;

FIG. 3 is a left side elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a top perspective view thereof.

The broken lines in the drawing depict environmental subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for a bonfire furnace, as shown and described. 